[linux-2.6-block.git] / arch / arm / mach-imx / gpc.c

/*
 * Copyright 2011-2013 Freescale Semiconductor, Inc.
 * Copyright 2011 Linaro Ltd.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>
#include <linux/irqchip/arm-gic.h>
#include "common.h"
#include "hardware.h"

#define GPC_CNTR		0x000
#define GPC_IMR1		0x008
#define GPC_PGC_GPU_PDN		0x260
#define GPC_PGC_GPU_PUPSCR	0x264
#define GPC_PGC_GPU_PDNSCR	0x268
#define GPC_PGC_CPU_PDN		0x2a0
#define GPC_PGC_CPU_PUPSCR	0x2a4
#define GPC_PGC_CPU_PDNSCR	0x2a8
#define GPC_PGC_SW2ISO_SHIFT	0x8
#define GPC_PGC_SW_SHIFT	0x0

#define IMR_NUM			4
#define GPC_MAX_IRQS		(IMR_NUM * 32)

#define GPU_VPU_PUP_REQ		BIT(1)
#define GPU_VPU_PDN_REQ		BIT(0)

#define GPC_CLK_MAX		6

struct pu_domain {
	struct generic_pm_domain base;
	struct regulator *reg;
	struct clk *clk[GPC_CLK_MAX];
	int num_clks;
};

static void __iomem *gpc_base;
static u32 gpc_wake_irqs[IMR_NUM];
static u32 gpc_saved_imrs[IMR_NUM];

void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw)
{
	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
		(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR);
}

void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw)
{
	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
		(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR);
}

void imx_gpc_set_arm_power_in_lpm(bool power_off)
{
	writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN);
}

void imx_gpc_pre_suspend(bool arm_power_off)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	/* Tell GPC to power off ARM core when suspend */
	if (arm_power_off)
		imx_gpc_set_arm_power_in_lpm(arm_power_off);

	for (i = 0; i < IMR_NUM; i++) {
		gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
		writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4);
	}
}

void imx_gpc_post_resume(void)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	/* Keep ARM core powered on for other low-power modes */
	imx_gpc_set_arm_power_in_lpm(false);

	for (i = 0; i < IMR_NUM; i++)
		writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
}

static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on)
{
	unsigned int idx = d->hwirq / 32;
	u32 mask;

	mask = 1 << d->hwirq % 32;
	gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask :
				  gpc_wake_irqs[idx] & ~mask;

	/*
	 * Do *not* call into the parent, as the GIC doesn't have any
	 * wake-up facility...
	 */
	return 0;
}

void imx_gpc_mask_all(void)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	for (i = 0; i < IMR_NUM; i++) {
		gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
		writel_relaxed(~0, reg_imr1 + i * 4);
	}

}

void imx_gpc_restore_all(void)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	for (i = 0; i < IMR_NUM; i++)
		writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
}

void imx_gpc_hwirq_unmask(unsigned int hwirq)
{
	void __iomem *reg;
	u32 val;

	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
	val = readl_relaxed(reg);
	val &= ~(1 << hwirq % 32);
	writel_relaxed(val, reg);
}

void imx_gpc_hwirq_mask(unsigned int hwirq)
{
	void __iomem *reg;
	u32 val;

	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
	val = readl_relaxed(reg);
	val |= 1 << (hwirq % 32);
	writel_relaxed(val, reg);
}

static void imx_gpc_irq_unmask(struct irq_data *d)
{
	imx_gpc_hwirq_unmask(d->hwirq);
	irq_chip_unmask_parent(d);
}

static void imx_gpc_irq_mask(struct irq_data *d)
{
	imx_gpc_hwirq_mask(d->hwirq);
	irq_chip_mask_parent(d);
}

static struct irq_chip imx_gpc_chip = {
	.name			= "GPC",
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_mask		= imx_gpc_irq_mask,
	.irq_unmask		= imx_gpc_irq_unmask,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_set_wake		= imx_gpc_irq_set_wake,
#ifdef CONFIG_SMP
	.irq_set_affinity	= irq_chip_set_affinity_parent,
#endif
};

static int imx_gpc_domain_xlate(struct irq_domain *domain,
				struct device_node *controller,
				const u32 *intspec,
				unsigned int intsize,
				unsigned long *out_hwirq,
				unsigned int *out_type)
{
	if (irq_domain_get_of_node(domain) != controller)
		return -EINVAL;	/* Shouldn't happen, really... */
	if (intsize != 3)
		return -EINVAL;	/* Not GIC compliant */
	if (intspec[0] != 0)
		return -EINVAL;	/* No PPI should point to this domain */

	*out_hwirq = intspec[1];
	*out_type = intspec[2];
	return 0;
}

static int imx_gpc_domain_alloc(struct irq_domain *domain,
				  unsigned int irq,
				  unsigned int nr_irqs, void *data)
{
	struct of_phandle_args *args = data;
	struct of_phandle_args parent_args;
	irq_hw_number_t hwirq;
	int i;

	if (args->args_count != 3)
		return -EINVAL;	/* Not GIC compliant */
	if (args->args[0] != 0)
		return -EINVAL;	/* No PPI should point to this domain */

	hwirq = args->args[1];
	if (hwirq >= GPC_MAX_IRQS)
		return -EINVAL;	/* Can't deal with this */

	for (i = 0; i < nr_irqs; i++)
		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
					      &imx_gpc_chip, NULL);

	parent_args = *args;
	parent_args.np = irq_domain_get_of_node(domain->parent);
	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
}

static const struct irq_domain_ops imx_gpc_domain_ops = {
	.xlate	= imx_gpc_domain_xlate,
	.alloc	= imx_gpc_domain_alloc,
	.free	= irq_domain_free_irqs_common,
};

static int __init imx_gpc_init(struct device_node *node,
			       struct device_node *parent)
{
	struct irq_domain *parent_domain, *domain;
	int i;

	if (!parent) {
		pr_err("%s: no parent, giving up\n", node->full_name);
		return -ENODEV;
	}

	parent_domain = irq_find_host(parent);
	if (!parent_domain) {
		pr_err("%s: unable to obtain parent domain\n", node->full_name);
		return -ENXIO;
	}

	gpc_base = of_iomap(node, 0);
	if (WARN_ON(!gpc_base))
	        return -ENOMEM;

	domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
					  node, &imx_gpc_domain_ops,
					  NULL);
	if (!domain) {
		iounmap(gpc_base);
		return -ENOMEM;
	}

	/* Initially mask all interrupts */
	for (i = 0; i < IMR_NUM; i++)
		writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);

	return 0;
}

/*
 * We cannot use the IRQCHIP_DECLARE macro that lives in
 * drivers/irqchip, so we're forced to roll our own. Not very nice.
 */
OF_DECLARE_2(irqchip, imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);

void __init imx_gpc_check_dt(void)
{
	struct device_node *np;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
	if (WARN_ON(!np))
		return;

	if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");

		/* map GPC, so that at least CPUidle and WARs keep working */
		gpc_base = of_iomap(np, 0);
	}
}

static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
{
	int iso, iso2sw;
	u32 val;

	/* Read ISO and ISO2SW power down delays */
	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
	iso = val & 0x3f;
	iso2sw = (val >> 8) & 0x3f;

	/* Gate off PU domain when GPU/VPU when powered down */
	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);

	/* Request GPC to power down GPU/VPU */
	val = readl_relaxed(gpc_base + GPC_CNTR);
	val |= GPU_VPU_PDN_REQ;
	writel_relaxed(val, gpc_base + GPC_CNTR);

	/* Wait ISO + ISO2SW IPG clock cycles */
	ndelay((iso + iso2sw) * 1000 / 66);
}

static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
{
	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);

	_imx6q_pm_pu_power_off(genpd);

	if (pu->reg)
		regulator_disable(pu->reg);

	return 0;
}

static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
{
	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
	int i, ret, sw, sw2iso;
	u32 val;

	if (pu->reg)
		ret = regulator_enable(pu->reg);
	if (pu->reg && ret) {
		pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
		return ret;
	}

	/* Enable reset clocks for all devices in the PU domain */
	for (i = 0; i < pu->num_clks; i++)
		clk_prepare_enable(pu->clk[i]);

	/* Gate off PU domain when GPU/VPU when powered down */
	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);

	/* Read ISO and ISO2SW power down delays */
	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
	sw = val & 0x3f;
	sw2iso = (val >> 8) & 0x3f;

	/* Request GPC to power up GPU/VPU */
	val = readl_relaxed(gpc_base + GPC_CNTR);
	val |= GPU_VPU_PUP_REQ;
	writel_relaxed(val, gpc_base + GPC_CNTR);

	/* Wait ISO + ISO2SW IPG clock cycles */
	ndelay((sw + sw2iso) * 1000 / 66);

	/* Disable reset clocks for all devices in the PU domain */
	for (i = 0; i < pu->num_clks; i++)
		clk_disable_unprepare(pu->clk[i]);

	return 0;
}

static struct generic_pm_domain imx6q_arm_domain = {
	.name = "ARM",
};

static struct pu_domain imx6q_pu_domain = {
	.base = {
		.name = "PU",
		.power_off = imx6q_pm_pu_power_off,
		.power_on = imx6q_pm_pu_power_on,
		.power_off_latency_ns = 25000,
		.power_on_latency_ns = 2000000,
	},
};

static struct generic_pm_domain imx6sl_display_domain = {
	.name = "DISPLAY",
};

static struct generic_pm_domain *imx_gpc_domains[] = {
	&imx6q_arm_domain,
	&imx6q_pu_domain.base,
	&imx6sl_display_domain,
};

static struct genpd_onecell_data imx_gpc_onecell_data = {
	.domains = imx_gpc_domains,
	.num_domains = ARRAY_SIZE(imx_gpc_domains),
};

static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
{
	struct clk *clk;
	int i;

	imx6q_pu_domain.reg = pu_reg;

	for (i = 0; ; i++) {
		clk = of_clk_get(dev->of_node, i);
		if (IS_ERR(clk))
			break;
		if (i >= GPC_CLK_MAX) {
			dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
			goto clk_err;
		}
		imx6q_pu_domain.clk[i] = clk;
	}
	imx6q_pu_domain.num_clks = i;

	/* Enable power always in case bootloader disabled it. */
	imx6q_pm_pu_power_on(&imx6q_pu_domain.base);

	if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
		return 0;

	pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
	return of_genpd_add_provider_onecell(dev->of_node,
					     &imx_gpc_onecell_data);

clk_err:
	while (i--)
		clk_put(imx6q_pu_domain.clk[i]);
	return -EINVAL;
}

static int imx_gpc_probe(struct platform_device *pdev)
{
	struct regulator *pu_reg;
	int ret;

	/* bail out if DT too old and doesn't provide the necessary info */
	if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
		return 0;

	pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
	if (PTR_ERR(pu_reg) == -ENODEV)
		pu_reg = NULL;
	if (IS_ERR(pu_reg)) {
		ret = PTR_ERR(pu_reg);
		dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
		return ret;
	}

	return imx_gpc_genpd_init(&pdev->dev, pu_reg);
}

static const struct of_device_id imx_gpc_dt_ids[] = {
	{ .compatible = "fsl,imx6q-gpc" },
	{ .compatible = "fsl,imx6sl-gpc" },
	{ }
};

static struct platform_driver imx_gpc_driver = {
	.driver = {
		.name = "imx-gpc",
		.of_match_table = imx_gpc_dt_ids,
	},
	.probe = imx_gpc_probe,
};

static int __init imx_pgc_init(void)
{
	return platform_driver_register(&imx_gpc_driver);
}
subsys_initcall(imx_pgc_init);
Commit	Line	Data
9fbbe689	1	/*
263475d4	2	* Copyright 2011-2013 Freescale Semiconductor, Inc.
9fbbe689 SG	3	* Copyright 2011 Linaro Ltd.
	4	*
	5	* The code contained herein is licensed under the GNU General Public
	6	* License. You may obtain a copy of the GNU General Public License
	7	* Version 2 or later at the following locations:
	8	*
	9	* http://www.opensource.org/licenses/gpl-license.html
	10	* http://www.gnu.org/copyleft/gpl.html
	11	*/
	12
00eb60a8 PZ	13	#include <linux/clk.h>
00eb60a8 PZ	14	#include <linux/delay.h>
9fbbe689 SG	15	#include <linux/io.h>
	16	#include <linux/irq.h>
	17	#include <linux/of.h>
	18	#include <linux/of_address.h>
	19	#include <linux/of_irq.h>
00eb60a8 PZ	20	#include <linux/platform_device.h>
	21	#include <linux/pm_domain.h>
	22	#include <linux/regulator/consumer.h>
520f7bd7	23	#include <linux/irqchip/arm-gic.h>
9a67a6fd	24	#include "common.h"
00eb60a8	25	#include "hardware.h"
9fbbe689	26
00eb60a8	27	#define GPC_CNTR 0x000
9fbbe689	28	#define GPC_IMR1 0x008
00eb60a8 PZ	29	#define GPC_PGC_GPU_PDN 0x260
	30	#define GPC_PGC_GPU_PUPSCR 0x264
	31	#define GPC_PGC_GPU_PDNSCR 0x268
9fbbe689	32	#define GPC_PGC_CPU_PDN 0x2a0
05136f08 AH	33	#define GPC_PGC_CPU_PUPSCR 0x2a4
	34	#define GPC_PGC_CPU_PDNSCR 0x2a8
	35	#define GPC_PGC_SW2ISO_SHIFT 0x8
	36	#define GPC_PGC_SW_SHIFT 0x0
9fbbe689 SG	37
9fbbe689 SG	38	#define IMR_NUM 4
b923ff6a	39	#define GPC_MAX_IRQS (IMR_NUM * 32)
9fbbe689	40
00eb60a8 PZ	41	#define GPU_VPU_PUP_REQ BIT(1)
	42	#define GPU_VPU_PDN_REQ BIT(0)
	43
	44	#define GPC_CLK_MAX 6
	45
	46	struct pu_domain {
	47	struct generic_pm_domain base;
	48	struct regulator *reg;
	49	struct clk *clk[GPC_CLK_MAX];
	50	int num_clks;
	51	};
	52
9fbbe689 SG	53	static void __iomem *gpc_base;
	54	static u32 gpc_wake_irqs[IMR_NUM];
	55	static u32 gpc_saved_imrs[IMR_NUM];
	56
05136f08 AH	57	void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw)
	58	{
	59	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) \|
	60	(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR);
	61	}
	62
	63	void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw)
	64	{
	65	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) \|
	66	(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR);
	67	}
	68
	69	void imx_gpc_set_arm_power_in_lpm(bool power_off)
	70	{
	71	writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN);
	72	}
	73
80c0ecdc	74	void imx_gpc_pre_suspend(bool arm_power_off)
9fbbe689 SG	75	{
	76	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	77	int i;
	78
	79	/* Tell GPC to power off ARM core when suspend */
80c0ecdc	80	if (arm_power_off)
05136f08	81	imx_gpc_set_arm_power_in_lpm(arm_power_off);
9fbbe689 SG	82
	83	for (i = 0; i < IMR_NUM; i++) {
	84	gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
	85	writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4);
	86	}
	87	}
	88
	89	void imx_gpc_post_resume(void)
	90	{
	91	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	92	int i;
	93
	94	/* Keep ARM core powered on for other low-power modes */
05136f08	95	imx_gpc_set_arm_power_in_lpm(false);
9fbbe689 SG	96
	97	for (i = 0; i < IMR_NUM; i++)
	98	writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
	99	}
	100
	101	static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on)
	102	{
b923ff6a	103	unsigned int idx = d->hwirq / 32;
9fbbe689 SG	104	u32 mask;
9fbbe689 SG	105
e2fd06f6	106	mask = 1 << d->hwirq % 32;
9fbbe689 SG	107	gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] \| mask :
	108	gpc_wake_irqs[idx] & ~mask;
	109
b923ff6a MZ	110	/*
	111	* Do not call into the parent, as the GIC doesn't have any
	112	* wake-up facility...
	113	*/
9fbbe689 SG	114	return 0;
	115	}
	116
263475d4 AH	117	void imx_gpc_mask_all(void)
	118	{
	119	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	120	int i;
	121
	122	for (i = 0; i < IMR_NUM; i++) {
	123	gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
	124	writel_relaxed(~0, reg_imr1 + i * 4);
	125	}
	126
	127	}
	128
	129	void imx_gpc_restore_all(void)
	130	{
	131	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	132	int i;
	133
	134	for (i = 0; i < IMR_NUM; i++)
	135	writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
	136	}
	137
65bb688a	138	void imx_gpc_hwirq_unmask(unsigned int hwirq)
9fbbe689 SG	139	{
	140	void __iomem *reg;
	141	u32 val;
	142
b923ff6a	143	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
9fbbe689	144	val = readl_relaxed(reg);
65bb688a	145	val &= ~(1 << hwirq % 32);
9fbbe689 SG	146	writel_relaxed(val, reg);
	147	}
	148
65bb688a	149	void imx_gpc_hwirq_mask(unsigned int hwirq)
9fbbe689 SG	150	{
	151	void __iomem *reg;
	152	u32 val;
	153
b923ff6a	154	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
65bb688a MZ	155	val = readl_relaxed(reg);
	156	val \|= 1 << (hwirq % 32);
	157	writel_relaxed(val, reg);
	158	}
	159
	160	static void imx_gpc_irq_unmask(struct irq_data *d)
	161	{
65bb688a	162	imx_gpc_hwirq_unmask(d->hwirq);
b923ff6a	163	irq_chip_unmask_parent(d);
65bb688a MZ	164	}
	165
	166	static void imx_gpc_irq_mask(struct irq_data *d)
	167	{
65bb688a	168	imx_gpc_hwirq_mask(d->hwirq);
b923ff6a	169	irq_chip_mask_parent(d);
9fbbe689 SG	170	}
9fbbe689 SG	171
b923ff6a	172	static struct irq_chip imx_gpc_chip = {
e33b6752 MZ	173	.name = "GPC",
	174	.irq_eoi = irq_chip_eoi_parent,
	175	.irq_mask = imx_gpc_irq_mask,
	176	.irq_unmask = imx_gpc_irq_unmask,
	177	.irq_retrigger = irq_chip_retrigger_hierarchy,
	178	.irq_set_wake = imx_gpc_irq_set_wake,
	179	#ifdef CONFIG_SMP
	180	.irq_set_affinity = irq_chip_set_affinity_parent,
	181	#endif
b923ff6a MZ	182	};
	183
	184	static int imx_gpc_domain_xlate(struct irq_domain *domain,
	185	struct device_node *controller,
	186	const u32 *intspec,
	187	unsigned int intsize,
	188	unsigned long *out_hwirq,
	189	unsigned int *out_type)
9fbbe689	190	{
5d4c9bc7	191	if (irq_domain_get_of_node(domain) != controller)
b923ff6a MZ	192	return -EINVAL; /* Shouldn't happen, really... */
	193	if (intsize != 3)
	194	return -EINVAL; /* Not GIC compliant */
	195	if (intspec[0] != 0)
	196	return -EINVAL; /* No PPI should point to this domain */
	197
	198	*out_hwirq = intspec[1];
	199	*out_type = intspec[2];
	200	return 0;
	201	}
	202
	203	static int imx_gpc_domain_alloc(struct irq_domain *domain,
	204	unsigned int irq,
	205	unsigned int nr_irqs, void *data)
	206	{
	207	struct of_phandle_args *args = data;
	208	struct of_phandle_args parent_args;
	209	irq_hw_number_t hwirq;
485863b8	210	int i;
9fbbe689	211
b923ff6a MZ	212	if (args->args_count != 3)
	213	return -EINVAL; /* Not GIC compliant */
	214	if (args->args[0] != 0)
	215	return -EINVAL; /* No PPI should point to this domain */
	216
	217	hwirq = args->args[1];
	218	if (hwirq >= GPC_MAX_IRQS)
	219	return -EINVAL; /* Can't deal with this */
	220
	221	for (i = 0; i < nr_irqs; i++)
	222	irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
	223	&imx_gpc_chip, NULL);
	224
	225	parent_args = *args;
5d4c9bc7	226	parent_args.np = irq_domain_get_of_node(domain->parent);
b923ff6a MZ	227	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
	228	}
	229
9b589a83	230	static const struct irq_domain_ops imx_gpc_domain_ops = {
b923ff6a MZ	231	.xlate = imx_gpc_domain_xlate,
	232	.alloc = imx_gpc_domain_alloc,
	233	.free = irq_domain_free_irqs_common,
	234	};
	235
	236	static int __init imx_gpc_init(struct device_node *node,
	237	struct device_node *parent)
	238	{
	239	struct irq_domain parent_domain, domain;
	240	int i;
	241
	242	if (!parent) {
	243	pr_err("%s: no parent, giving up\n", node->full_name);
	244	return -ENODEV;
	245	}
	246
	247	parent_domain = irq_find_host(parent);
	248	if (!parent_domain) {
	249	pr_err("%s: unable to obtain parent domain\n", node->full_name);
	250	return -ENXIO;
	251	}
	252
	253	gpc_base = of_iomap(node, 0);
	254	if (WARN_ON(!gpc_base))
	255	return -ENOMEM;
	256
	257	domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
	258	node, &imx_gpc_domain_ops,
	259	NULL);
	260	if (!domain) {
	261	iounmap(gpc_base);
	262	return -ENOMEM;
	263	}
9fbbe689	264
485863b8 SG	265	/* Initially mask all interrupts */
	266	for (i = 0; i < IMR_NUM; i++)
	267	writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);
	268
b923ff6a	269	return 0;
9fbbe689	270	}
00eb60a8	271
b923ff6a MZ	272	/*
	273	* We cannot use the IRQCHIP_DECLARE macro that lives in
	274	* drivers/irqchip, so we're forced to roll our own. Not very nice.
	275	*/
	276	OF_DECLARE_2(irqchip, imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);
	277
14517564 MZ	278	void __init imx_gpc_check_dt(void)
	279	{
	280	struct device_node *np;
	281
	282	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
634a6037 LS	283	if (WARN_ON(!np))
	284	return;
	285
	286	if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
	287	pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
	288
	289	/* map GPC, so that at least CPUidle and WARs keep working */
	290	gpc_base = of_iomap(np, 0);
	291	}
14517564 MZ	292	}
14517564 MZ	293
00eb60a8 PZ	294	static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
	295	{
	296	int iso, iso2sw;
	297	u32 val;
	298
	299	/* Read ISO and ISO2SW power down delays */
	300	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
	301	iso = val & 0x3f;
	302	iso2sw = (val >> 8) & 0x3f;
	303
	304	/* Gate off PU domain when GPU/VPU when powered down */
	305	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
	306
	307	/* Request GPC to power down GPU/VPU */
	308	val = readl_relaxed(gpc_base + GPC_CNTR);
	309	val \|= GPU_VPU_PDN_REQ;
	310	writel_relaxed(val, gpc_base + GPC_CNTR);
	311
	312	/* Wait ISO + ISO2SW IPG clock cycles */
	313	ndelay((iso + iso2sw) * 1000 / 66);
	314	}
	315
	316	static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
	317	{
	318	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
	319
	320	_imx6q_pm_pu_power_off(genpd);
	321
	322	if (pu->reg)
	323	regulator_disable(pu->reg);
	324
	325	return 0;
	326	}
	327
	328	static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
	329	{
	330	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
	331	int i, ret, sw, sw2iso;
	332	u32 val;
	333
	334	if (pu->reg)
	335	ret = regulator_enable(pu->reg);
	336	if (pu->reg && ret) {
	337	pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
	338	return ret;
	339	}
	340
	341	/* Enable reset clocks for all devices in the PU domain */
	342	for (i = 0; i < pu->num_clks; i++)
	343	clk_prepare_enable(pu->clk[i]);
	344
	345	/* Gate off PU domain when GPU/VPU when powered down */
	346	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
	347
	348	/* Read ISO and ISO2SW power down delays */
	349	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
	350	sw = val & 0x3f;
	351	sw2iso = (val >> 8) & 0x3f;
	352
	353	/* Request GPC to power up GPU/VPU */
	354	val = readl_relaxed(gpc_base + GPC_CNTR);
	355	val \|= GPU_VPU_PUP_REQ;
	356	writel_relaxed(val, gpc_base + GPC_CNTR);
	357
358	/* Wait ISO + ISO2SW IPG clock cycles */
359	ndelay((sw + sw2iso) * 1000 / 66);
360
361	/* Disable reset clocks for all devices in the PU domain */
362	for (i = 0; i < pu->num_clks; i++)
363	clk_disable_unprepare(pu->clk[i]);
364
365	return 0;
366	}
367
368	static struct generic_pm_domain imx6q_arm_domain = {
369	.name = "ARM",
370	};
371
372	static struct pu_domain imx6q_pu_domain = {
373	.base = {
374	.name = "PU",
375	.power_off = imx6q_pm_pu_power_off,
376	.power_on = imx6q_pm_pu_power_on,
377	.power_off_latency_ns = 25000,
378	.power_on_latency_ns = 2000000,
379	},
380	};
381
382	static struct generic_pm_domain imx6sl_display_domain = {
383	.name = "DISPLAY",
384	};
385
386	static struct generic_pm_domain *imx_gpc_domains[] = {
387	&imx6q_arm_domain,
388	&imx6q_pu_domain.base,
389	&imx6sl_display_domain,
390	};
391
392	static struct genpd_onecell_data imx_gpc_onecell_data = {
393	.domains = imx_gpc_domains,
394	.num_domains = ARRAY_SIZE(imx_gpc_domains),
395	};
396
397	static int imx_gpc_genpd_init(struct device dev, struct regulator pu_reg)
398	{
399	struct clk *clk;
00eb60a8 PZ	400	int i;
	401
	402	imx6q_pu_domain.reg = pu_reg;
	403
	404	for (i = 0; ; i++) {
	405	clk = of_clk_get(dev->of_node, i);
	406	if (IS_ERR(clk))
	407	break;
	408	if (i >= GPC_CLK_MAX) {
	409	dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
	410	goto clk_err;
	411	}
	412	imx6q_pu_domain.clk[i] = clk;
	413	}
	414	imx6q_pu_domain.num_clks = i;
	415
d438462c LS	416	/* Enable power always in case bootloader disabled it. */
	417	imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
	418
	419	if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
	420	return 0;
00eb60a8	421
d438462c	422	pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
00eb60a8 PZ	423	return of_genpd_add_provider_onecell(dev->of_node,
	424	&imx_gpc_onecell_data);
	425
	426	clk_err:
	427	while (i--)
	428	clk_put(imx6q_pu_domain.clk[i]);
	429	return -EINVAL;
	430	}
	431
00eb60a8 PZ	432	static int imx_gpc_probe(struct platform_device *pdev)
	433	{
	434	struct regulator *pu_reg;
	435	int ret;
	436
b17c70cd LS	437	/* bail out if DT too old and doesn't provide the necessary info */
	438	if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
	439	return 0;
	440
00eb60a8 PZ	441	pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
	442	if (PTR_ERR(pu_reg) == -ENODEV)
	443	pu_reg = NULL;
	444	if (IS_ERR(pu_reg)) {
	445	ret = PTR_ERR(pu_reg);
	446	dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
	447	return ret;
	448	}
	449
	450	return imx_gpc_genpd_init(&pdev->dev, pu_reg);
	451	}
	452
	453	static const struct of_device_id imx_gpc_dt_ids[] = {
	454	{ .compatible = "fsl,imx6q-gpc" },
	455	{ .compatible = "fsl,imx6sl-gpc" },
	456	{ }
	457	};
	458
	459	static struct platform_driver imx_gpc_driver = {
	460	.driver = {
	461	.name = "imx-gpc",
00eb60a8 PZ	462	.of_match_table = imx_gpc_dt_ids,
	463	},
	464	.probe = imx_gpc_probe,
	465	};
	466
	467	static int __init imx_pgc_init(void)
	468	{
	469	return platform_driver_register(&imx_gpc_driver);
	470	}
	471	subsys_initcall(imx_pgc_init);